• Code: 6220
• Description: Abnormally high fuser edge thermistor temperature
  Fuser thermistor 2 detects a temperature higher than 220°C/428°F for 1 s.
• Causes: Fuser unit. Engine PWB.
• Remedy: Fuser unit 1. Confirm that the wiring connector is firmly connected and, if necessary, connect the connector all the way in. Fuser unit and Engine PWB (YC26) 2. If the wiring is disconnected, shorted or grounded, replace the wiring. 3. Replace the Fuser unit and execute U167 counter clear.
  Engine PWB 1. Check the engine software and upgrade to the latest, if necessary. 2. Replace the engine PWB.

• Code: 6230
• Description: Broken fuser edge thermistor wire
  The Input signal from the fuser thermistor 2 is 992 or more (A/D value) continuously for 1 s when the temperature at the fuser thermistor 1 is higher than 100°C/212°F. Fuser thermistor 2 detects a lower then 50°C/122°F for 15s during werming up.
• Causes: Fuser unit. Engine PWB
• Remedy: Fuser unit 1. Confirm that the wiring connector is firmly connected and, if necessary, connect the connector all the way in. Fuser unit and Engine PWB (YC26) 2. If the wiring is disconnected, shorted or grounded, replace the wiring. 3. Replace the Fuser unit and execute U167 counter clear.
  Engine PWB 1. Check the engine software and upgrade to the latest, if necessary. 2. Replace the engine PWB.

• Code: 6250
• Description: Abnormally low fuser edge thermistor temperature
  Fuser thermistor 2 detects a temperature lower than 100°C/212°F for 1 s during ready or print. Fuser thermistor 2 detects a temperature lower than 50°C/ 122°F for 1 s during low power mode.
• Causes: Fuser unit. Engine PWB.
• Remedy: Fuser unit 1. Confirm that the wiring connector is firmly connected and, if necessary, connect the connector all the way in. 2. Fuser unit and Engine PWB (YC26) If the wiring is disconnected, shorted or grounded, replace the wiring. 3. Replace the Fuser unit and execute U167 counter clear.
  Engine PWB 1. Check the engine software and upgrade to the latest, if necessary. 2. Replace the engine PWB.

• Code: 6320
• Description: Abnormally high fuser middle thermistor 3 temperature
  Fuser middle thermistor 3 detects a temperature higher than 205°C/401°F for 1 s.
• Causes: Fuser unit. Engine PWB.
• Remedy: Fuser unit 1. Confirm that the wiring connector is firmly connected and, if necessary, connect the connector all the way in. Fuser unit and Engine PWB (YC26) 2. If the wiring is disconnected, shorted or grounded, replace the wiring. 3. Replace the Fuser unit and execute U167 counter clear.
  Engine PWB 1. Check the engine software and upgrade to the latest, if necessary. 2. Replace the engine PWB.

• Code: 6400
• Description: Zero-cross signal error
  While fuser heater ON/OFF control is performed, the zerocross signal is not input within 3 s.
• Causes: Fuser unit.
• Remedy: Fuser unit 1. Confirm that the wiring connector is firmly connected and, if necessary, connect the connector all the way in. Fuser heater PWB (YC2) and feed PWB 1 (YC27) 2. If the wiring is disconnected, shorted or grounded, replace the wiring. 3. Replace the fuser heater PWB.

• Code: 6610
• Description: Fuser release sensor error
  When the fuser release motor is driven, the fuser release sensor does not turn on/off for 8 s.
• Causes: Fuser release motor. Fuser release sensor. Engine PWB.
• Remedy: Fuser release motor 1. To check the motor operation, execute U030 Fuser Release. 2. Check that the drive gear can be rotated and the separation is possible. 3. If the motor won’t rotate, confirm that the wiring connector is firmly connected and, if necessary, connect the connector all the way in. Fuser unit and Engine PWB (YC26) 4. If the wiring is disconnected, shorted or grounded, replace the wiring. 5. Replace the fuser unit and execute U167 counter clear.
  Fuser release sensor 1. Check that the sensor is correctly positioned. 2. Check that the sensor is not contaminated or damaged.
  Engine PWB 1. Check the engine software and upgrade to the latest, if necessary. 2. Replace the engine PWB.

• Code: 6910
• Description: Engine software ready error
  The device won’t engage in ready state in 60 minutes after warming-up has began. (A previous timeout process has not been cancelled.)
• Causes: Engine PWB.
• Remedy: 1. Turn the main power switch off and after 5 seconds, turn it on. 2. Reinstall the engine software. 3. Replace the engine PWB.

• Code: 7001
• Description: Toner motor error
  A state that a lock is detected 5 times in a row in 200ms cycle when the Toner motor is driven has occurred 30 times in total.
• Causes: Toner container. Toner motor. Screw sensor. Engine PWB.
• Remedy: Toner container 1. Check that the spiral screw of the toner container can be rotated by the hand. 2. Check for broken gears and replace if any.
  Toner motor 1. Draw out the toner container and execute U135 to check the toner motor operation. 2. Check the drive gear can rotate or they are not unusually loaded and, if necessary, replace. 3. Confirm that the wiring connector is firmly connected and, if necessary, connect the connector all the way in. Toner motor and Engine PWB (YC27) 4. If the wiring is disconnected, shorted or grounded, replace the wiring. 5. Replace the Toner motor.
  Screw sensor 1. Check that the sensor is correctly positioned. 2. Confirm that the wiring connector is firmly connected and, if necessary, connect the connector all the way in. Screw sensor and Front PWB (YC5) Front PWB (YC2) and Engine PWB (YC7) 3. Replace the Screw sensor.
  Engine PWB 1. Check the engine software and upgrade to the latest, if necessary. 2. Replace the engine PWB.